Shooting yourself with a serpa is a training issue, its not a flaw in the holster design. If you train to release the pistol with the pad of your finger, not the tip, you aren't going to have an issue. People using the tip of their finger can set themselves up for an ND through the thigh. Its a good holster, you just have to possess a little brain power and use some caution. Should be required for firearms handling anyway, right?
Edited to add, I also vote for Hip carry.